/**
 * 自定义弹窗鼠标拖拽
 * */

import Vue from "vue";

Vue.directive("drag", {
  bind(el) {
    //弹框可拉伸最小宽高

    let minWidth = 600;

    let minHeight = 300;

    //初始非全屏

    let isFullScreen = false;

    //当前宽高

    let nowWidth = 0;

    // eslint-disable-next-line no-unused-vars
    let nowHight = 0;

    //当前顶部高度

    let nowMarginTop = 0;

    //获取弹框头部（这部分可双击全屏）

    const dialogHeaderEl = el.querySelector(".box_head");

    //弹窗

    const dragDom = el.querySelector(".edit_box");

    //给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；

    dragDom.style.overflow = "auto";

    //清除选择头部文字效果

    //dialogHeaderEl.onselectstart = new Function("return false");

    //头部加上可拖动cursor

    dialogHeaderEl.style.cursor = "move";

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);

    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

    let moveDown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离

      const disX = e.clientX - dialogHeaderEl.offsetLeft;

      const disY = e.clientY - dialogHeaderEl.offsetTop;

      // 获取到的值带px 正则匹配替换

      let styL, styT;

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px

      if (sty.left.includes("%")) {
        styL = +document.body.clientWidth * (+sty.left.replace(/%/g, "") / 100);

        styT = +document.body.clientHeight * (+sty.top.replace(/%/g, "") / 100);
      } else {
        styL = +sty.left.replace(/px/g, "");

        styT = +sty.top.replace(/px/g, "");
      }

      document.onmousemove = function (e) {
        // 通过事件委托，计算移动的距离

        const l = e.clientX - disX;

        const t = e.clientY - disY;

        // 移动当前元素

        dragDom.style.left = `${l + styL}px`;

        dragDom.style.top = `${t + styT}px`;

        //将此时的位置传出去

        //binding.value({x:e.pageX,y:e.pageY})
      };

      document.onmouseup = function () {
        document.onmousemove = null;

        document.onmouseup = null;
      };
    };

    dialogHeaderEl.onmousedown = moveDown;

    //双击头部全屏效果

    dialogHeaderEl.ondblclick = () => {
      if (isFullScreen == false) {
        nowHight = dragDom.clientHeight;

        nowWidth = dragDom.clientWidth;

        nowMarginTop = dragDom.style.marginTop;

        dragDom.style.left = 0;

        dragDom.style.top = 0;

        dragDom.style.height = "100VH";

        dragDom.style.width = "100VW";

        dragDom.style.marginTop = 0;

        isFullScreen = true;

        dialogHeaderEl.style.cursor = "initial";

        dialogHeaderEl.onmousedown = null;
      } else {
        dragDom.style.height = "auto";

        dragDom.style.width = nowWidth + "px";

        dragDom.style.marginTop = nowMarginTop;

        isFullScreen = false;

        dialogHeaderEl.style.cursor = "move";

        dialogHeaderEl.onmousedown = moveDown;
      }
    };

    dragDom.onmousemove = function (e) {
      // let moveE = e;

      if (
        e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10 ||
        dragDom.offsetLeft + 10 > e.clientX
      ) {
        dragDom.style.cursor = "w-resize";
      } else if (
        el.scrollTop + e.clientY >
        dragDom.offsetTop + dragDom.clientHeight - 10
      ) {
        dragDom.style.cursor = "s-resize";
      } else {
        dragDom.style.cursor = "default";

        dragDom.onmousedown = null;
      }

      dragDom.onmousedown = (e) => {
        const clientX = e.clientX;

        const clientY = e.clientY;

        let elW = dragDom.clientWidth;

        let elH = dragDom.clientHeight;

        let EloffsetLeft = dragDom.offsetLeft;

        let EloffsetTop = dragDom.offsetTop;

        dragDom.style.userSelect = "none";

        let ELscrollTop = el.scrollTop;

        //判断点击的位置是不是为头部

        if (
          clientX > EloffsetLeft &&
          clientX < EloffsetLeft + elW &&
          clientY > EloffsetTop &&
          clientY < EloffsetTop + 100
        ) {
          //如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;
        } else {
          document.onmousemove = function (e) {
            e.preventDefault(); // 移动时禁用默认事件

            //左侧鼠标拖拽位置

            if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {
              //往左拖拽

              if (clientX > e.clientX) {
                dragDom.style.width = elW + (clientX - e.clientX) * 2 + "px";
              }

              //往右拖拽

              if (clientX < e.clientX) {
                if (dragDom.clientWidth >= minWidth) {
                  dragDom.style.width = elW - (e.clientX - clientX) * 2 + "px";
                }
              }
            }

            //右侧鼠标拖拽位置

            if (
              clientX > EloffsetLeft + elW - 10 &&
              clientX < EloffsetLeft + elW
            ) {
              //往左拖拽

              if (clientX > e.clientX) {
                if (dragDom.clientWidth >= minWidth) {
                  dragDom.style.width = elW - (clientX - e.clientX) * 2 + "px";
                }
              }

              //往右拖拽

              if (clientX < e.clientX) {
                dragDom.style.width = elW + (e.clientX - clientX) * 2 + "px";
              }
            }

            //底部鼠标拖拽位置

            if (
              ELscrollTop + clientY > EloffsetTop + elH - 20 &&
              ELscrollTop + clientY < EloffsetTop + elH
            ) {
              //往上拖拽

              if (clientY > e.clientY) {
                if (dragDom.clientHeight >= minHeight) {
                  dragDom.style.height = elH - (clientY - e.clientY) * 2 + "px";
                }
              }

              //往下拖拽

              if (clientY < e.clientY) {
                dragDom.style.height = elH + (e.clientY - clientY) * 2 + "px";
              }
            }
          };

          //拉伸结束

          document.onmouseup = function () {
            document.onmousemove = null;

            document.onmouseup = null;
          };
        }
      };
    };
  },
});
